Source/Sink Information - National Instruments USB-6008 User Manual And Specifications

Caution Exceeding the maximum input voltage ratings or maximum output ratings, which
are listed in the Specifications, can damage the DAQ device and the computer. National
Instruments is not liable for any damage resulting from such signal connections.

Source/Sink Information

USB-6008/6009 User Guide and Specifications
1
LED
LED
2
3
4
1 P0.0 configured as an open-drain digital output driving a LED
2 P0.2 configured as a push-pull digital output driving a LED
3 P0.4 configured as a digital input receiving a TTL signal from a gated invertor
4 P0.7 configured as a digital input receiving a 0 V or 5 V signal from a switch
Figure 12. Example of Connecting a Load
The default configuration of the USB-6008/6009 DIO ports is open-drain,
allowing 5 V operation, with an onboard 4.7 kΩ pull-up resistor. An
external, user-provided, pull-up resistor can be added to increase the source
current drive up to a 8.5 mA limit per line as shown in Figure 13.
The USB-6009 ports can also be configured as push-pull using the DAQmx
API, allowing 3.3 V operation with a source/sink current limit of ± 8.5 mA.
Refer to DAQmx Help»Making Digital I/O Signal Connections for more
information about how to set the DIO configuration.
+5 V
+5 V TTL Signal
Switch
I/O Connector
16
P0.0
P0.1
P0.2
P0.3
P0.4
P0.5
P0.6
P0.7
GND
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